Reservoir Report

Guadalupe Reservoir reservoir

California, USA USBR
Today high
--
Tonight low
--
Current storage
1,870acre-ft
% of normal
11%
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Right now · current storage
Guadalupe Reservoir
USBR · GDR
1,870 acre-ft
As of 2026-05-11
Seasonal avg
1,684
Record max
5,970,706,231,720,000
24h change
-0.2%
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Guadalupe Reservoir -- None reservoir
Guadalupe Reservoir None
About this reservoir

Guadalupe Reservoir

Guadalupe Reservoir in California was constructed in 1959 and is located in the Santa Cruz Mountains. The reservoir is fed by the Guadalupe Creek and is a part of the Santa Clara Valley Water District's water supply system. The hydrology of the reservoir is largely dependent on surface flow from the creek and snowpack providers in the surrounding mountains. The reservoir provides water for agricultural and recreational purposes, including irrigation and fishing. However, due to the ongoing drought in California, the water level in the reservoir has been lower than usual, affecting its ability to meet the water needs of the surrounding communities. Additionally, the reservoir has experienced issues with algae blooms and contamination in recent years, leading to temporary closures for recreational use.

StateNone
OperatorUSBR
Site IDGDR
Percent of normal11%
Last updated2026-05-11
Records since2021
Storage trends

Daily levels at Guadalupe Reservoir

Storage volume, pool elevation, and total release plotted from the operating agency's daily observations.

Storage

acre-ft · code 2

Pool Elevation

ft · code 1

Detailed forecast

Plan around the weather

Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.

Hourly detail

Next 5 days, hour by hour

Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.

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Deep dive

5-day forecast table

Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.

TimeConditionTemp (°F)Snow (in)Rain (in)Humidity (%)Wind (mps)Wind dir
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Long-term outlook

15-day temperature & precipitation

Daily temperatures, snow, and rain projected over the next two weeks.

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Regional inflow

Nearby streamflow gauges

USGS streamgauges around Guadalupe Reservoir -- inflows here typically show up in storage 24-72 hours later.

Track Guadalupe Reservoir in the Snoflo app

Save this reservoir as a favorite and set push alerts when storage crosses a threshold (e.g. "alert me at 80% of normal").

FAQ

About Guadalupe Reservoir

Where does the data for Guadalupe Reservoir come from?

Daily storage, pool elevation, and release rates are sourced from USGS, USBR, and USACE monitoring stations. Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.

How often is the report updated?

Storage observations are updated daily by the operating agency. The 15-day weather forecast refreshes throughout the day. Snoflo caches and renders the most recent observation -- check the "as of" timestamp on the storage card.

What does the Hazard hazard rating mean?

The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.

What's "% of normal"?

The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).

Can I get alerts when storage crosses a threshold?

Yes -- alerts are managed in the Snoflo iOS app. Favorite this reservoir, set a threshold, and you'll get a push the moment conditions cross.

More reservoirs

Other water bodies near here

Snoflo-tracked reservoirs and dams within driving distance of Guadalupe Reservoir.

Premium feature

Favorites and alerts are part of Snoflo Premium. Save reservoirs, set storage thresholds, and get push notifications when conditions cross.

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Manage alerts in the Snoflo app

Custom alerts are configured in the iOS app -- favorite this reservoir, set a threshold, and you'll get a push the moment conditions cross.

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